Henby fischee



(No Model.)

H. FISCHER.

STEAM ROCK DRILL.

Patented Feb. 16, 1886'.

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1W ATTORNEYS.

UNITED STATES PATENT GEEICE.

HENRY FISCHER, OF NEW YORK, N. Y.

STEAM ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 336,401, dated February 16, 1886.

(No model.)

To all whom, it may concern:

Be it known that I, HENRY FIscHER, a citizen of Germany, residing at New York, in the county and State of New York, have invented new and useful Improvements in Steam Rock- 4Drills, of which thefbllowingisaspecieation.

My invention relates to improvements in rock-drills; and it consists in certain novel features of construction, which are fully pointed out in the following specification and claims and illustrated in the accompanying drawings, in which- Figure l represents a sectional side view of a rock-drill embodying my improvements. Fig. 2 is a transverse section thereof in the plane y y, Fig. l. Fig. 3 is a similar section in the plane x x, Fig. l. Fig. 41s a section in the plane z z, Fig. l, of the top cylinder-head. Fig. 5 is a section in the plane a" cv ofthe valve-chest. Fig. 6 is an end view of the valve-chest, the chest-head being removed.

Similar letters indicate corresponding parts. In the drawings, the letter A designates the main cylinder of the rock-drill. B is the piston which works in the cylinder. C is the valve-chest. a a', Figs. l and, are thesteamports leading from this valve-chest to the ends of the main cylinder. D is the valve which works in the valve-chest. E is the admissionport to the valve-chest; and c c are the eX- haust-ports from the valve-chest, which open into a common channel, E', opening outward. The valve D is provided with circumferential grooves which form pistons d d d2, closely tting the ,cylindrical bore of the valve-chest, thus leaving isolated steam-spaces surrounding the necks between the pistons. Of the three pistons d d d, piston d controls exhaustport c, piston d the admission-port E, and the piston d2 exhaust-port c. The valve is reciprocated by steam entering the valve-chest at either end of the same through passages b b, Figs. l and 5, leading from the interior of the cylinder t0 the valve-chest, and which passages are opened and closed by the piston B. To remove the steam from behind the end pistons, d (Z2, of the valve, small exhaust-passages e e lead from both ends of the valvechest to the exhaustports c c', and said passages are controlled by hinged ap-valves F F', which are firmly secured to a spindle, f,

having bearings in the walls of the cylinder, and which valves F F are actuated by the valveD. The flap-valves F F are secured to the spindle at such an angle to each other that when one is closed by the valve D the other is open, and vice versa, and that face of each flap-valve which fis engaged by the valve D is somewhat inclined, so that it -may be engaged without shock by said valve. Since the openings of the passages controlled by the flap-valves F F are located a short distance from each end of the valve-chest, the shutting off of the escape at this point will cushion the valve D, and thus prevent the same from strk ing violently against the chest-heads.

The turning ofthe pistou,and consequently the turning of the drill,is elected by means of a shank, G, having thereon threads of a large pitch, one end of which shank has thereon a ratchet-wheel, g, which is engaged by suitable springpressed pawls,g, extending through the upper cy1inder-head, A, which pawls are thrown backward when engaged by the face of the teeth so as to allow the ratchet to rotate, while when the ratchet-wheel is thrown in a reverse direction the pawls are engaged by the rear of the teeth and bind against the walls of their bearings so as to prevent the ratchet from turning. The opposite end of the shank engages a nut, g2, in the piston B, and can extend into a recess in said piston. From the previous description it will be observed that the piston will be turned only on its upward non-working stroke.

The cylinder A, as usual in rock-drills, is provided with suitable guides,h, Fig. 3, which bear in guideways formed in a housing, H, and through a suitable Way in the casting of the cylinder extends a feed-screw, I, which is engaged by a nut, J, Figs. 1 and 2, bearing in an extension ot' the upper cylinder-head, A', so that when the nut is turned in the proper direction the cylinder will be fed forward. To automatically turn this nut I provide an auxiliary cylinder, L, which has a steam-inlet passage, Z, Figs. l, 2, and 4, from the main cylinder A, and in said cylinder L works a plunger, Z', which engages with a lever, M, pivoted to the head A at m, and one arm of which carries a feed-pawl, m', which engages with ratchet-teeth j on the nut J. The other IOO arm of the lever M is subjected to the action What I claim as new, and desire to secure l f a spring-pressedplunger, N, which lworks in a housing 'cast on the cylinder-head, so that the arm which carries the pawl forces the 5 plunger back to its upper position after the same has been moved outward by the steam from the cylinder. A stolp, m'l, governs'the outward sweep of the lever M, and therefore the possible length of the stroke of the plunger :o l can be set by the set-screw Z2 in the head of the cylinder, whereby the arc through which the nut J is rotated can be regulated. The

feed-pawlm is subjected to the-action of a spring, m3, Fig. 2, for an obvious reason.

y Steam enters the auxiliary cylinder to actuate the plunger Z when the piston is-on the downward stroke and exhausts therefrom when the exhaust-port is opened.

The operation ot' the drill is as follows: As

2o shown in the drawings, the piston B is at the end of the downward stroke, and the exhaust through steam-port a is opened. As the piston ends its downward stroke, it opens steam- 'passages b, and live steam impinges upon the piston di and movesthe valve D to theposition shown in Fig. l, thereby opening the admission of steam through the admission-port E to `theinterior of the valve-chest and in the steamspace be'tween'the pistons b' b2, from which it '3o passes into the cylinder and drives the piston in its upward stroke. The live steam admitted through port E cannot escape through exhaust-port c, because the latter is now closed by piston d2 of the valve, while the exhauststeam passes from port a into the space between pistons d d and escapes through eX- haust-port o, which is open in this portion of the valve. As the valve D is moved to the position shown in Fig. l, it .strikes ap-valve 40 F and closes the same, whereby flap-valve F at the opposite end of the cylinder which was closed is opened, so that when the valve Dreverses, the steam behind piston d2 can escape through the passage e.

Instead of actuating the valve D by steam from the cylinder, motion could be imparted thereto by the use of a system of Valve-gear connected with the piston-rod or other moving part; but I prefer to use the steam-actuated 5o Valve.

by Letters Patent, is'- 1. The combination, with the cylinder, the valve-chest, the admission-port E, the channel E', the ports a a,leading from the cylinder to 55 the valve-chest, the passages b b,leading from the`ends ofthe 4valve-chestto thecylinder, the exhaust-ports c c', opening-into said channel, and exhaust-passages e e', of the steam-moved valve D, having three pistons, d d' d, theone, 60 d, controlling the steam-ad mission port E, the other, d, controlling the exhaust-port c, and the other, d2, controlling the exhaust-port c', substantially as described.

.2. The combination, substantially as shown and described, of the steam-ports a ci', leading from the valve-chest to the cylinder, the

admission-port E, the exhaust-ports c c', properly aligned in the valve-chest, the steam-actuated piston-valve D. the exhaust-passages@ e', 7o

leading from the ends ofthe valve-chest to the exhaust-port, and the valves F F, governing the exhaust-ports and actuated by the valve D, substantially as shown and described.

3. The combination,withthemain cylinder, 7.5 the piston, the feed-screw I, and housing 'H, ofthe toothed nut J,engaging the feed-screw, the auxiliary cylinder L in steam-connection with the main cylinder by aport,Z,the plunger l in said cylinder L, the spring-pressed lever 8o M, engaged by the plunger, and the pawl m, hinged to the lever to engage the teeth on the nut, substantially as shown and described.

4.-. The combination,with the main cylinder, the piston, the feed-screw I, land housing-H, of thetoothed nut J, engaging the feed-screw, the auxiliary cylinder L, the port Z leading from the main cylinder to the same, the plunger Z in the auxiliary' cylinder, the spring-pressed lever M, the pawl m thereof', the stop m2, and 9o regulating-screw Z2, substantially as shown and described.

In testimony whereof I have hereunto set my hand and seal in the presence of two subscribing witnesses.

HENRY insonnia. [n s] Vitncsses: W. HAUFF,

A. FABER DU FAUR, J r. 

